john mccain, director of central intelligence, robert mcnamara who wasn't for the political but was a registered republican. douglas dillon, the secretary of the treasury, said he had made sure that a lot of his advisers were actually very centrist. he wasn't getting the left lanning partisan people around him. >> host: let me ask one last question about the tapes you've dedicated your life to the project university of public affairs. talk a little bit about the value of the tapes but also about the potential pitfalls because some of the hudson because the tapes are so wonderful that we could focus too much on them and there might be a danger to them. >> guest: we have been working on these tapes since 1998 we have a whole team of people, colleagues, students, scholars working on this comes a we are trying to work through this remarkable resource but they have to be used with care and i have tried to be careful about doing that in the book. it's tempting to write a book that is the list of transcript and there's a lot of use for historical reference in doing that as a part of our work